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Scientific Name | Haworthia retusa (L.) Duval |
Higher Classification | Monocotyledons |
Family | ASPHODELACEAE |
National Status |
Status and Criteria | Data Deficient - Taxonomically Problematic |
Assessment Date | 2014/03/24 |
Assessor(s) | L. von Staden, R.R. Klopper & J.C. Manning |
Justification | A taxonomically problematic species that is difficult to distinguish from H. mutica, as well as some forms of H. pygmaea. Until taxonomically resolved, its risk of extinction cannot be assessed. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | Bredasdorp and Swellendam to Mossel Bay. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Fynbos |
Description | Stony, shale soil with very short bushes and a covering of pebbles on the ground. |
Threats |
| Threatened by habitat loss to expanding crop cultivation, urban expansion and overgrazing. Illegal collecting for the specialist succulent horticultural trade is also causing losses to subpopulations that occur in accessible sites. |
Population |
Population trend | Decreasing |
Notes |
| Haworthia has been plagued with an overprolification of names, recognising variation over similarity, and causing much confusion (Bayer and Manning 2012). The genus needs to be revised using population-level molecular techniques in order for species concepts to be resolved (J.C. Manning pers. comm. 2014). |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Haworthia retusa (L.) Duval | Data Deficient (Taxonomically Problematic) | 2014.1 | | Haworthia retusa (L.) Duval | EN A2bc | 2013.1 | | Haworthia geraldii C.L.Scott | Threatened | 2012.1 | | Haworthia retusa (L.) Duval | VU A2a | 2012.1 | | Haworthia turgida Haw. var. suberecta Poelln. | Threatened | 2012.1 | | Haworthia retusa (L.) Duval | VU A2a | Raimondo et al. (2009) | | Haworthia turgida Haw. var. suberecta Poelln. | Threatened | Raimondo et al. (2009) | | Haworthia geraldii C.L.Scott | Threatened | Raimondo et al. (2009) | | Haworthia turgida Haw. var. longibracteata (G.G.Sm.) M.B.Bayer | Least Concern | Raimondo et al. (2009) | | Haworthia turgida Haw. var. turgida | Least Concern | Raimondo et al. (2009) | | Haworthia mutica Haw. var. nigra M.B.Bayer | EN B1ab(ii,iii,iv,v)+2ab(ii,iii,iv,v) | Raimondo et al. (2009) | |
Bibliography |
Bayer, M.B. 1999. Haworthia Revisited: A revision of the genus. Umdaus Press, Hatfield.
Bayer, M.B. and Manning, J.C. 2012 (Updated online 2013). The Haworthia nomenclator: A list of accepted species with some guidelines for infraspecific names. Haworthia Update 7(4):30-40.
Goldblatt, P. and Manning, J.C. 2000. Cape Plants: A conspectus of the Cape Flora of South Africa. Strelitzia 9. National Botanical Institute, Cape Town.
Raimondo, D., von Staden, L., Foden, W., Victor, J.E., Helme, N.A., Turner, R.C., Kamundi, D.A. and Manyama, P.A. 2009. Red List of South African Plants. Strelitzia 25. South African National Biodiversity Institute, Pretoria.
Scott, C.L. 1985. The genus Haworthia, a taxonomic revision. Aloe Books, Johannesburg.
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Citation |
| von Staden, L., Klopper, R.R. & Manning, J.C. 2014. Haworthia retusa (L.) Duval. National Assessment: Red List of South African Plants version . Accessed on 2025/05/14 |
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